[Xsltforms-support] how can I get the query string parameters in xforms

[Mathias P. <Mat...@gm...>]

I want to dynamically load my instance data, using something like 

http://example.com/xforms/EditorTypeA?instance=id401

I searched, but there does not seem to be an xforms way to do this, so
what would be a portable javascript way be? 

Putting the parameter value in something like a currentDocument instance
on load and then use a replacing submission using that instance value on
xforms-ready??

If that's the way, this could probably be generalized to generate a
simple xml instance from any query string
(<querystring><paramX>valueX</paramX></querystring>), does something
like that exist?

Thx for any help,

Mathias